The Study Of Construction Method Of Long-span Concrete-filled Steel Tubular Arch Bridges

This thesis is concentrated on the method of adjusting cables in the new construction technology for diagonal fastening and connecting by use of jacks and cables and the method of the concrete perfusion of concrete filled steel tubular (CFST) long-span arch bridges. On the background of the scientific research items about long-span concrete filled steel tubular arch bridge: the Wu Shan Yangtze River Bridge(a 460m span, will be the longest span CFST arch bridge in the world).1.This thesis summarized current calculating method and theories about CFST arch bridge, discussed CFST mechanical properties.2.By the computer simulation technique analysis of the segmental construction of CFST arch bridge. This thesis studies the application of dynamic adjusting cables and control with pre-evaluated height. In order to solve the problem of the times and methodological restrict of adjusting cables force and accurately calculating the magnitude of pre-evaluated height, the thesis introduces the optimization theory and method into the calculation of erecting arch ribs in the integrated construction technology of dynamic adjusting cables and controlling with pre-evaluated height. This paper also had analysis of buckle about the segmental construction of CFST arch bridge.3.This thesis also analyzed the process filled concrete into the vacant steel tubular. This paper analyzed the influence on the distortion, internal force and stabilization of the structure by different order concrete filled.